Demons are mindless, monsters with no thoughts other than eating and killing.
Angels are blessed, humans who have exceptional ability in controlling 'Cael', the element which drives their society.
Yet one day, a high-ranking angel is tasked with eliminating a demon who he finds out has a human conscious. He decides to spare her, but that decision comes with consequences when she follows him back to the Celestial Reef, the home of Angels, and insists that she will become an Angel herself...